Isuzu N-Series. Manual - part 110

SERVICE INFORMATION 00-13

Clearance between Shackle 
Pin and Bushing

mm (in)

0.1 (0.0039)

0.5 (0.019)

ITEMS

SERVICE STANDARD

SERVICE LIMIT

00-14 SERVICE INFORMATION

SERVICING

Steering System

Manual Steering Gear Oil

1. Remove the filler plug on the steering unit (1).

2. Fill the gear box to the level of filler plug with spec-

ified gear oil through the filler hole.

3. Install and tighten the filler plug.

Power Steering Fluid

Draining

1. Jack up the front wheels until they are clear of the

ground.

2. Disconnect the fluid pipes between the steering

unit and fluid reservoir, and the fluid hose between
the pump and the fluid reservoir.

3. When draining is completed, remove remaining flu-

id within hydraulic system by turning the steering
wheel to stop in both directions several times.

Hose Replacement
Replace the power steering hoses at intervals of fluid
change.

Refilling

1. Connect the fluid lines securely and fill the fluid res-

ervoir with specified automatic transmission fluid.

2. When the fluid reservoir is filled to specified level,

allow 2 or 3 minutes. While refilling, keep fluid res-
ervoir replenished as necessary to prevent air from
entering the hydraulic system.

3. Lower the front wheels to the ground. Start and let

the engine idle for a few minutes.
Recheck the fluid level and replenish if necessary.

Steering Wheel Free Play

Inspection

1. Check the amount of the steering wheel play by

turning the wheel in both directions until the tires

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SERVICE INFORMATION 00-15

begin to move with the front wheels properly in the
straight ahead position.

Notice:
If the vehicle is equipped with a power steering unit, the
wheel free play should be checked with the engine run-
ing.

Steering Wheel Free Play
Manual Steering: 10 — 30 mm (0.4 — 1.2 in)
Power Steering: 10 — 50 mm (0.4 — 2.0 in)

2. Also check the steering wheel for play and loose-

ness in mount by moving it back and forth and side-
ways. While driving, check for hardsteering,
shimmy and tendency of steering to pull to one
side.

Adjustment

1. Align the front wheels properly in the straight

ahead position.

2. Loosen the lock nut on the adjusting screw of the

steering unit.

3. Turn the adjust screw clockwise to decrease free

play or counter-clockwise to increase.

4. After check of specified free play, tighten the lock

nut to specified torque.

Tighten:

• Lock nut to

Manual Steering: 25 N

⋅m (2.5 kg⋅m / 18 lb⋅ft)

Power Steering: 69 N

⋅m (7.0 kg⋅m / 51 lb⋅ft)

Power Steering Fluid Pressure

Preparation

1. Install the power steering fluid pressure gauge be-

tween the pump and steering unit as figure.
Gauge: 5-8840-0162-0

2. Start and let the engine idle until oil temperature

reaches 50 — 60

°C (122 — 140°F).

3. Take measurement of the pressure gauge when

the steering wheel is turned clockwise or counter-
clockwise to lock.

Standard Pressure (at idle speed)

• NQR without HBB: 11,275 kPa (115 kg/cm

2

/1,635

psi)

• NPR/NPS/NQR with HBB: 10,787 kPa (110 kg/

cm

2

/1,563 psi)

• except Above Models: 10,297 kPa (105 kg/cm

2

/

1,439 psi)

Excess pressure means pump trouble.
Less pressure means steering unit trouble.

Notice:
This test should be done within ten seconds.

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00-16 SERVICE INFORMATION

Steering Function

Check the following items.

• Steering wheel shake
• Steering shimmy
• Hard steering
• Turning radius
• Steering wheel return
• Steering pull to one side

Inspection of Wheel Alignment

The points listed below must be checked prior to inspec-
tion front wheel alignment.

• Tire pressure and abnormal wear
• Front hub bearing for axial play
• Ball joint on steering linkage for play
• Operation of shock absorbers
• Tightness of suspension parts
• King pin bearings for play

Toe-In

Measurement should be taken with the vehicle on a sur-
face plate.
If a surface plate is not available, toe-in should be
checked with the vehicle parked on a level floor.

1. Set front wheels to its straight ahead position.
2. Align the toe-in gauge with center height of each

wheels at front end.

3. Apply center marks to each wheel, then take mea-

surement of distance A between the center marks
on each wheel.

4. Move slowly the vehicle rearward until center

marks get its rear end position.

5. Take measurement of distance B between the cen-

ter marks at rear end.

Toe-in can be calculated with next formula.
Toe-in = B 

− A

Toe-in

−2 — 2 mm (−0.08 — 0.08 in)

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